middle pair top kicker vs LAG

[Man of Means]

Old hand from 1/2 foxwoods (live) game. Villain is a thinking LAG, but I have not picked him off yet.

Stacks around $220, villain has about $800

EP player limps, Villain limps in MP and another player limps in HJ, I raise ATo on the button to $12. BB calls, Villain calls, HJ calls.

Pot $60, 5 players
Flop is K T 2 with two diamonds. I have no diamond.

BB checks, EP bets, villain bets $40, HJ folds, Hero...?

I realize I am probably ahead but if I call I suck at playing the turn in this situation. What is the default play?